Carburetor



G. F. PETERSON.

ACARBURETOR.

APPUCATION FILED JULY 31,1918.

1,43296330 Patented @et l?? w22.

G. F. PETERSON.

CARBURETOR.

APPLICATION FILED JULY 31,1918.

Patented Oct. 17, 1922.

2 SHEETS vSHEET Z.

ramas ca; i7, 1922.1

atrae-armas amasar. rETEasoN, `or SALT Lann CITY, UTAH.

i CARBURETOR.

Application led July 3.1, 191%. Serial No. 247,575.

To all lwhom it may concern: l

Be it known that GEORGE F. PETERSON, a citizen of the United States,residing at Salt Lake City, in the county of Salt Lake and State ofUtah, has invented certain new and useful improvements in C'arburetors,of which the following is a specification.

This invention relates to carburetors for.

internal combustion engines and it has for its object to provide animproved device of this nature whereby volatile fuel oils may` beproperly mixed with air for use as an explosive mixture in internalcombustionv engines.

A further object of the invention is to provide a carburetor which willautomatically supply a mixture of the proper richness to the enginewhether the engine be run at low or high speed.

A further ob]ect of the invention is to provide a carburetor which' inaybe easily cleaned and adjusted quickly to suit the nature of the fueloil being used.

In the accompanying drawings in which like reference charactersdesignate corresponding parts throughout the several views, v

Fig. 1 is a vertical section of a carburetor constructed in accordancewith the inven tion' Fig. 2 is a horizontal section on line of Fig. 1.

iFig. 3 is a side elevation of the carburetor; and

Fig. 4 is a horizontal section through a fuel distributing element,hereinafter described.

The carburetor comprises a tubular cap A and a main casing B upon whichsaid cap is mounted. The cap may be screwed on the casing, as indicatedat b or soldered thereto, as desired. The cap is provided with anoutstanding ange l, to adapt it for attachment to the intake manifold,not shown, of an internal combustion engine. The passage of thecarbureted air through the tubular cap A. is controlled by an ordinarybut. terfiy valve 2. lower portion of the ltubular cap A and terminatein angular ports 4, which open into the bore of the tubular cap A.Radial air passages 5 establish communication between the passages 3 andthe atmosphere when a band 6 which encireles the cap A is moved to suchposition as to cause openings Passages 3 are formed in the 7 formed insaid band to register with the passages 5.

That portion of the `space within the casing B and above a partitionwall 16 which s ans. said casing constitutes la heating c amber,circulating pipes 8 being provided to conduct the heating medium to andfrom said chamber. The lieatingmedium may be the exhaust gases from theengine, or otherwise. v

Venturi tubes 14 having theV restricted portions v22 extend verticallythrough the lhea-ting chamber and communicate at their` upper ends withthe passages 3. The lower ends of these tubes project `through thepartition wall 16 terminating at the lower side" thereof and are openfor the reception of the fuel nozzles 21, which terminate adjacent therestricted portions 22 of said tubes. The several fuel nozzles receivetheir fuel through radial passages 19a formed in a plate 19 whichconstitutes the bottom of the casing B. All of the assages 19a are fedthrough a passage 20 w ich is in communication with a passage 10 in atap bolt 9 through a passage. 10?'. The bolt 9 is dis posed verticallyin a lateral extension 19b of the plate 19 and secures this extension toa fuel supply chamber C in which the level of the fuel may be maintainedat any desired point, in any Well known manner, such, for example, as bya float B, commonly used in carburetors. The bolt l9 Vnot 'only securesthe extension 19b to the fuel supply chamber C, as stated, but serves toestablish communication between the passage 2() and the float chamberand thus feeds all of the fuel supply nozzles from the said float cham-'ing B and through ports 11 in casing B with which the ports 12 areadapted to be brought into registration.

A tubular heater 15 is disposed centrally within the casing B andextends from the division wall 16 to the under side of the cap A. Thisheater, which is preferably a separate unit, is provided with aplurality of radial webs 15a and it serves te take up and store the heatfrom the heating medium and to, in turn, heat the Venturi tubes 14- andthe carbureted air through them and also to beat l.' i tion operated Itubular valve 17 that is mounted for vertical movement partly in thebore of the cap A and partly in the bore of heater 15. The suctionoperated valve is provided with a guide rod 24 which passes through webs15EL of the heater and through a'guide 'opening 25 formed in the bottomor plate 19, whereby the suction operated valve is held against turning.The valve 17 is provided with a depending tubular extension 18 and afuel supply nozzle 23 projects into this tubular extension. The'passageof the fuel there- .through is controllable by means of needle valve v30cooperating with such nozzle. This needle valve is adjustable verticallyin the 'plate 19 at the juncture of the several orts 19a, and'itsadjustment controls the nozzle 23. The suction operated valve 17 isprovided with a plurality of ports of varying heights in its walls, saiports being designated 17a. These ports are successively brought intoregistry with the ports 4 as the suction in the manifold increases andcauses thelifting of the suction operated valve 17.

Vhen the engine is running at low speed the valve 17 is held at thebottom of its travel by gravity and inthat position none of the ports17a is in registry with any of the ports 4, and no air or fuel may enterthe manifold through tubular cap A except through the extension 18 ofthe suction operated valve. The area around the nozzle 23 is sorestricted as to cause the air to pass the end of this nozzle at a highvelocity, even if the engine is running at low speed, and this causesthe fuel to pass out of nozzle 23 in the form of a spray.

As the engine is speeded up by the opening of the throttle valve 2 thesuction becomes greater in the casing A and the valve 17 rises withinsuch casing and brings one or more of the ports 17"i into alinement withone or more of the ports 4, the position the valve assumes depending` onthe suction in casing A. In order to secure a richer mixture, when themotor speed is increased suddenly; what is, in effect, a dash-pot, isprovided by making the valve 17 fit somewhat snugly against its seat.This insures that the opening of additional ports by the lifting of thevalve 17 will be accompanied by such increased suction as will give theproper velocity of air past the nozzles 21. In other words .by makingthe valve 17 fit somewhat snugly only anappreciable increase in thesuction in the intake manifold.

provide for additional air or the curtailment of air through the tubes14, the ring 6 is provided as stated and this in turn serves to dilutethe mixture, at will. It is to be noted that this diluting of themixture occurs only with respect to those tubes 14 which have beenbrought into communication with the interior of the cap A by theoperation of the valve 17, for if the ports of the valve 17 have notregistered with the port 4 of any tube 14 there can be no passage of airthrough said port 4.

Having described my invention, what I desire to secure by Letters Patentis.

A carburetor comprising in combination a casing, a fuel distributingelement closing thebottom of said casing which carries a i plurality ofupstanding nozzles, means for supplying a hydrocarbon fuel to saidnozzles through said element, a cap piece mounted upon the top of saidcasing having a central bore and a plurality of ports leading from saidcentral bore to the lower face of said cap piece, a horizontal walldividing the space between the cap piece and the fuel distributingelement into lower and upper chambers, means for supplying a heatingmedium to the upper chamber, a plurality of Venturi tubes supportedbetweenthe horizontal wall and the cap piece and leading from the lowerchamber to the several ports aforesaid and into which the severalnozzles project, a central tubular element extending through the upperchamber into which one of said nozzles project and a floating tubularvalve mounted for sliding movement in said central tubular element andin the bore of the' cap piece and havingports of varying dimensionswhichsuccessively and cumulatively come into communication with the rst namedport of the cap piece and means for admitting air to the lower chamber.

In testimony whereof I aix my signature in the presence of twowitnesses.

